﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

namespace System.Drawing.Printing
{

    /// <summary>
    ///  Provides data for the <see cref='PrintDocument.QueryPageSettings'/> event.
    /// </summary>
    public class QueryPageSettingsEventArgs : PrintEventArgs
    {
        private PageSettings _pageSettings;

        /// <summary>
        ///  Initializes a new instance of the <see cref='QueryPageSettingsEventArgs'/> class.
        /// </summary>
        public QueryPageSettingsEventArgs(PageSettings pageSettings) : base() => _pageSettings = pageSettings;

        /// <summary>
        ///  Gets or sets the page settings for the page to be printed.
        /// </summary>
        public PageSettings PageSettings
        {
            get
            {
                PageSettingsChanged = true;
                return _pageSettings;
            }
            set
            {
                value ??= new PageSettings();
                _pageSettings = value;
                PageSettingsChanged = true;
            }
        }

        /// <summary>
        ///  It's too expensive to compare 2 instances of PageSettings class, as the getters are accessing the printer
        ///  spooler, thus we track any explicit invocations of the setters or getters on this class, and this field tracks
        ///  if PageSettings property was accessed. It will return a false positive when the user is reading property values,
        ///  but we'll take a perf hit in this case assuming this event is not used often.
        /// </summary>
        internal bool PageSettingsChanged { get; set; }
    }
}